Twitter says "an internal configuration change" is responsible for an outage that lasted for about an hour.

Thursday's outage began before noon PT; some users were able to access Twitter again by 12:45 p.m. Twitter says some users may be able to access the service as the company works on a fix.

The disruption appeared to affect both web and mobile app users. According to Down Detector, a website that tracks outages, problems were reported from the U.S., Europe and elsewhere.

Outages were widespread in Twitter's early years, so much so that a cartoon "fail whale" the company would put up during outages came to symbolize Twitter almost as much as its little blue bird icon. In recent years, outages have been less common.

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12:50 p.m.

Twitter appears to be back after a nearly hour-long outage.

The company said Thursday that it was investigating the problem but had not provided further updates as of 12:45 p.m. PT.

The outage began before noon. The company has not said how widespread the outage is. The disruption appeared to have affected both web and mobile app users. According to Down Detector, a website that tracks outages, problems are being reported from the U.S., Europe and elsewhere.

The outage is occurring as President Donald Trump convenes a White House conference of like-minded critics of Big Tech.

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12:30 p.m.

Twitter says it is investigating a problem with its service . Users across the U.S. and elsewhere are not able to access Twitter.

The company is not saying how widespread the outage is. The disruption appears to be affecting both web and mobile app users. The outage began before noon PT. According to Down Detector, a website that tracks outages, problems are being reported from the U.S., Europe and elsewhere.

Outages were widespread in Twitter's early years, so much so that a cartoon "fail whale" the company would put up during outages came to symbolize Twitter almost as much as its little blue bird icon. The whale was retired in 2013, largely because Twitter didn't want to be associated with what it represented any more. After all, outages had become far less common.

This time, Twitter's home page reads in part, "Something is technically wrong. Thanks for noticing."

The outage is occurring as President Donald Trump convenes a White House conference of like-minded critics of Big Tech.